What is WebService

What is WebService

By using WebService, your application can publish information to the world, or provide a certain function. It is a Web-based service and is published through the Web. , find and use.

WebService script platform needs to support XML+HTTP.

HTTP protocol is the most commonly used Internet protocol.

XML provides a language that can be used across different platforms and programming languages.

Why use WebService

The most important thing is to work together.

1. Cross-platform calling (WebService is not limited to the operating system, you can call the WebService service on Linux on Windows, and vice versa, the same applies to other systems);

2. Cross-platform calling Language calling (WebService is not limited to programming languages, you can call the WebService service provided by the C# language in the Java language, and vice versa, and the same applies to other languages);

3. Can be called remotely (by using WebService, Your application can publish information to the world, or provide a certain function, as long as there is Internet).

Use JDK to develop WebService

1. WebService server development

1. Create a server-side project. The project can be a Java Web project or It is an ordinary Java project, for example:

2. Create a new java class in the package under the source code directory src to provide WebService services. I created a Function here. class, provides services through the javax.jws.WebService annotation, publishes the service through the publish method of the javax.xml.ws.Endpoint class and provides the published address and published service class. The code is as follows:

 1 package com.jspweb.ws; 2  3 import javax.jws.WebService; 4 import javax.xml.ws.Endpoint; 5  6 /** 7  * WebService服务端案例 8  * @author AlanLee 9  * @version 2017/06/0210  * 使用@WebService注解标注实现类11  */12 @WebService13 public class Function {14     public String transWords(String words){15         String res = "";16         for(char ch : words.toCharArray()){17             res += ch+",";18         }19         return res;20     }21     22     public static void main(String[] args) {23         // 使用Endpoint(终端)类发布webservice24         Endpoint.publish("http://localhost:8089/service/function", new Function());25         System.out.println("Publish Success");26     }27 }

3. Start the main method to run this class, and print out the result Publish Success, indicating that the service is successfully published:

4. Open the browser and visit the address we published , you can see this effect:

## 5. Click the connection address behind WSDL to open the WSDL configuration. The access results are as follows:

WSDL is an XML-based language used to describe Web Services and how to access Web Services.

2. WebService client development

1. Create a client project. The project can be a Java Web project or an ordinary Java project, for example:

2. Use the eclipse tool to generate client code and follow the step-by-step operation:

① Select the project and right-click new>Other...:

②Enter web in the Wizards box, select Web Service Client, and click the next button:

③Enter the access address of the WSDL service description file, click next:

④ Click the Finish button, and eclipse will automatically help us generate the code required for the WebService client in the src directory:

⑤: The generated code is as follows:

#2. Write the client test class code. I wrote a test class under the same level directory and ran it Its main method, the result is as follows:

Such a simple WebService entry example is completed.

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